V-belt



Patented ug. 11, 1936 v 'v-BEL'r Abraham L. Freedlander, Dayton, Ohio, assignor to The Dayton" Rubber Manufacturing Company, Dayton, Ohio, a corporation of OhioY original application July 13, 1931, serial `No. 550,478. Divided and this application October 3, 1932, serial No. 635,968

9 Claims.

My invention.relates to belts and in particular to belts composed of a plurality of layers of concentrically wound sheets oi rubberized or rubber `impregnated fabric.

It is the object of my invention to provide a method of forming a belt` so that resistance to exing transversely will be inherent in the belt t structure in accordance with the arrangement of the layers of the belt or resistance to bending may be likewise secured by arranging the layers of the belt material. I

It is a further object to provide a method of forming a belt comprising rolling concentrically of a strip of rubber impregnated fabric, molding it by one or more operations so as to arrange the layers of fabric in planes to resist the flexing of the belt as desired without disturbing the flexing of the belt in other directions, and in some cases of forming teeth in the belt so arranged by severing portions of the belt so molded.

i It is an additional object thereby to use cheap vstraightlaid fabric and of quickly and economi,

One of the primary objects of my invention is to provide a structure that is so internally braced by the arrangement of the layers of fabric -that the tendency of the belt to twist torsionally about its longitudinal axis and thereby roll over in the groove in the pulley will be prevented, particularly when there is a movement of one pulley on which the belt is mounted put of alignment with another pulley on which the belt is mounted as in the case of generator drives on railway cars where the generator is xed beneath the car body and the truck is pivoted tothe car body. g

This application is a division of my application Serial No. 550,478, filed July, 13, 1931 now Patent 1,989,168 dated January 29, 1935.

Referring to the drawings, Figure 1 is an end.

elevationof the concentrically wound roll of rub berized fabric.

Figure 2 is aside elevation thereof. Figure 3 is a section through the mold showing the molding of the cylindrical raw stock roll 2 ure 5.

Figure 6 is a section on the` une s-o or rig;

Figure 'l is a section on the line 1,-1 of Fig-I ure 6.

Figure 8 shows the vulcanizing mold partially in section with the belt partially in section.

lFigure 9 is a section through a circular mold o and the belt to bring it to circular form in order to have it of uniform diameter.

Figure 10 is. a side elevation of the belt as so formed. t A f Figure 11 is a section through a mold'which 10 imparts to the lower portion of the belt such a form that it will t into a V-shaped pulley with the layers of belt material generally vertical while the upper portion of the belt has the layers generally horizontal, forming an arch-shaped brace 15 against transverse compression.

Figure 12 shows the belt formed in Figure 11 in the mold prior to molding to impart to the belt a form in which the major portion of the layers will be horizontal, orat least a sufficient number to prevent undue transverse flexing and in particular to preventrolling or twisting of the belt.

Figure 13 shows the mold and belt in section as molded.- I v Figure 14 is a section through a belt so molded comprised of two separate cylindrical bodies of concentrically wound rubberized fabric.

Referring to the drawings in detail, l indil, cates a strip of straight laid woven textile material constituting a fabric which is impregnated with rubber. Its preferable condition isL somewhat sticky orv tackyfso that when rolled concentrically 'as in Figure 1 it will remain in that rolled condition, while at the same time will be sufficiently pliable tobe molded into -any der sired cross section.

I have found that by arranging the this-concentrically wound sausage-like raw stock I in given planes by molding that I am enabled to control the resistance to forces applied to the 40 belt, depending 'upon its application to a drive.

In Figure 3, for instance, the mold halves 2 and 3 are so arranged that upon molding the belt raw stock shown in Figure 1, the layers will be arranged substantially vinthe vertical. `lI'his re- Sults in a belt that is laterally flexible but resists bending. If desired, in order Ato provide for-a belt that is thus stiffened that will still pass over small pulleys, teethmam be formedin the' underside ofthe belt* by placing the belt inthe suppoting holder 4 'and shearing portions"l therel from o form teeth by the knife 5. The result` is shown in Figure:` 5 and 6 Where teeth 6 arev formed on the lower side of the belt.

Furthermore, a large portion of rigid material 55 layers'V is provided above the corner 1 on the belt as at 8 which gives the belt such a construction that it will resist torsional twist and resist rolling over in the pulleys which action reduces its driving capacity or caus the belt to roll out of the pulleys.

After molding the belt or molding it and severing the teeth from it, the belt is placed in a vulcanized mold I having steam chambers I and vulcanized. l l

Referring to Figure 9 and Figure 10, it is sometimes necessary in providing a very accurate belt to4 bring the belt to size by employing amold such as the mold halves II and I2 or the mold halves I3 and I4.

When the mold halves I 3 and Il are utilized,'the lower portion of the belt is arranged with the layers 'of fabric material substantially vertical while the upper layers as at I5 are substantially horizontal, or at least arch-shaped to prevent and resist longitudinal compression.

This belt may then be laid in thelarger mold Ii which has the cover II and, when compressed to shape, it will have two groups of layers I8 and I9 arranged horizontally transversely of the belt to resist the twisting and rocking of the belt and its rolling.

In the form shown in Figure 14 two circular members such as I may be superimposed on one another as at 20 and 2'I and brought to shape in the mold, thus giving a rigid transverse struc-- ture that will prevent torsional twist while at the same time permitting a. reasonable degree of flexibility.

By providing a substantial portion of the belt above the corner 1, it is possible to secure great structural strength of the belt with the maximum driving power, and also to prevent the turningover of the belt when the pulleys are out of line, since the corner edge I is therebystiifened.

It will be understood that the plane of the belt refers to the plane which the belt includes when its ends are joined to make it endless; also that the term radial refers to a direction within this plane and passing outward from the inner surface of the belt, the latter being the surface facing the bottom of the pulley groove; also that the term axial refers to a direction perpendicular to the plane of the belt as defined-above.

' It will beunderstood that I desire to comprehend within my invention such modifications as may be clearly embraced within my claims and the scope of my invention. I,

Having thus fully described my invention, what I claim as new a'nd desire tosecure by Letters Patent, is: Y 1

1. In a method of manufacturing a belt, rolling a sheet of rubber-impregnated fabric upon itself from the center outwardly into a body with spirally-curved layers only, and moulding the body in moulds of polygonal cross section, to thus `change'its cross-sectional shape and -re-ariange the layers of fabric in planes to resistfthe layer stresses applied to' the belt.

2. In a method of manufacturing a belt, rolling a strip of fabric impregnated with rubber upon itself in spirally-curved layers to form a generally cylindrical body, and molding that body into Dlysonal cross-sectional form to rearrange thelayers of the lower haii' of the body into preponderately vertical planes and the layers in the upper half into preponderately horizontalplanes.

3. In a method of manufacturing a belt, rolling a strip of fabric impregnated with rubber concentrically to form a generally cylindrical body, molding that body with the lower half of the layers arranged substantially vertically, and the 5 upper layers arranged horizontally, and again molding the beltrto reduce the vertical dimension of the belt, extend the belt laterally and arrange a substantial portion of the layers above and below 'the center of the'belt in horizontal planes. 10 4. In a method of forming a belt, rolling a strip of rubber impregnated fabric upon itself in spirally-curved layers to form a body of cylindrical cross section, applying a second cylindrical body of similar character to one side of the first 15 -body and molding the two bodies together to transform their cross-sectional shapes into a combined body of approximately hexagonal shape.

5. In a method of forming a belt, rolling a strip of rubber impregnated fabric upon itself in spirally-curved layers to form a body of cylindrical cross section, applying a second cylindrical body of similar character to one sideof the first body and molding the two bodies together to transform their cross-sectional shapes into a combined body of approximately hexagonal shape, the fabric layers being so arranged during the molding that a predominant proportion of the layers of the belt so formedwill be in' parallel 30 planes.

6. In a method of forming a belt, rolling concentrically upon itself a strip of rubberized fabric and compressing said roll of fabric into hexagonal section having a flat top and fiat bottom and V-shaped sides. for the belt, and by so molding the belt arranging the layers of fabric to a substantialamount in horizontal planes above and below the center line of the belt.

part of the body into substantially an axial position, and then pressing and vulcanizing the body thus shaped.

8. A 'method of manufacturing belts which consists of rolling a sheet of rubber-impregnated fabric upon itself in spirally-curved layers to form a -body of approximately circular cross section, reshaping the body into roughly hexagonal fform by .moving approximately the inner half of the fabric layers into substantially radial positions and approximately the outer half of the fabric layers into substantially axial positions, and. then pressing and vulcanizing the thus shaped body.

9.,A method of manufacturing belts which consists of rolling a sheet of rubber-impregnated fabric upon itself in spirally-curved layers to form a body of approximately circular cross section, rearranging the fabric layers on the inner part of the body to substantially a radial position and the fabric layers on the outer part of the body into'substantially an axial position by reshaping the body while cold, and then pressing and vulcanizing the body thus shaped.

ABRAHAM L. FREEDLANDER. 

